After google the web, I finally found how to modify the welcome center button. The welcome center information is kept in oobe.xml file which is located in c:\windows\system32\oobe\info\oobe.xml. Some OEM vendor modify the oobe default to be inside certain folders.

For my laptop as an example, the vendor is HP. Therefore, in the oobe.xml file in c:\windows\system32\oobe\info\oobe.xml I need to look in the default section which tells you the actual location of the woking oobe.xml file. In my case is C:\Windows\System32\oobe\Info\244\1033.

The oobe file is an xml file so it's easy to figure out how to remove items from it. If you want to find more detail about how to modify it. You can reference to the article that I found on the internet. Here is the link. http://www.pchell.com/support/removewelcomecentericons.shtml